GE IC693MDL742 Thyristor module

Content introduction

Locate down conductors as close as practical to air terminals and to the most convenient places for attaching the conductors to the earth electrode subsystem of the structure. The down conductors should be equally and symmetrically spaced about the perimeter of the structure.At least two down conductors are required on all structures except on slender objects like flagpoles, antenna masts (not substantial towers), light poles, and the like. (e) Provide one additional down conductor for each additional 30 meters (100 feet) or fraction thereof on structures having a perimeter exceeding 75 meters (250 feet). On structures having flat or gently sloping roofs and on irregular-shaped structures, the number of down conductors should be such that the length of the average roof conductor joining them does not exceed 30 meters (100 feet). The spacing between down conductors need not be less than 15 meters (50 feet).

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